From: Improving stand-to-sit maneuver for individuals with spinal cord injury
Hip and knee cylinders | Valves | Proportional valve | Knee accumulator | ||
---|---|---|---|---|---|
Manufacturer | Clippard Minimatic | Hydraforce | Parker Hannifin | Parker Hannifin | Clippard Minimatic |
Type | double acting | 4-way, 2-pos normally closed | 2-way manual needle valve | 2-way, normally closed | spring return single-acting |
Bore | 7/8″ | − | – | – | 3/4″ |
Port | 1/8″ NPT | SAE 6 | 1/8″ NPT | SAE 4, 1/4" NPTF | 1/8″ NPT |
Stroke | 3″ | – | – | – | 1″ |
Rod diameter | 0.25″ | – | – | – | 0.25″ |
Voltage | – | 12 VDC | – | 12 VDC | – |
Max operating pressure | 2000 psi | 3000 psi | 6000 psi | 3000 psi | 250 psi |
Spring force | – | – | – | – | 3 lbs installed 6lbs compressed |